The domestic dog has undergone extensive artificial se- lection resulting in an extreme diversity in body size, personality, life-history, and metabolic traits among breeds. Here we tested whether proactive personalities (high levels of activity, boldness, and aggression) are related to a fast "pace of life" (high rates of growth, mortality, and energy expenditure). Data from the literature provide preliminary evidence that artificial selection on dogs (through do- mestication) generated variations in personality traits that are cor- related with life histories and metabolism. We found that obedient (or docile, shy) breeds live longer than disobedient (or bold) ones and that aggressive breeds have higher energy needs than unaggressive ones. These correlations could result from either human preference for particular trait combinations or, more likely, correlated responses to artificial selection on personality. Our results suggest the existence of a general pace-of-life syndrome arising from the coevolution of personality, metabolic, and life-history traits.

/pdf/the-pace-of-life-under-artificial-selection-personality-4zje8tyrul.pdf

The pace of life under artificial selection: personality, energy expenditure, and longevity are correlated in domestic dogs.

In most animal taxa, longevity increases with body size across species, as predicted by the oxidative stress theory of aging. In contrast, in within-species comparisons of mammals and especially domestic dogs (e.g. Patronek et al., '97; Michell, '99; Egenvall et al., 2000; Speakman et al., 2003), longevity decreases with body size. We explore two datasets for dogs and find support for a negative relationship between size and longevity if we consider variation across breeds. Within breeds, however, the relationship is not negative and is slightly, but significantly, positive in the larger of the two datasets. The negative across-breed relationship is probably the consequence of short life spans in large breeds. Artificial selection for extremely high growth rates in large breeds appears to have led to developmental diseases that seriously diminish longevity.

Do Large Dogs Die Young

Limited information is available on what constitutes optimal growth in dogs. The primary aim of this study was to develop evidence-based growth standards for dogs, using retrospective analysis of bodyweight and age data from >6 million young dogs attending a large corporate network of primary care veterinary hospitals across the USA. Electronic medical records were used to generate bodyweight data from immature client-owned dogs, that were healthy and had remained in ideal body condition throughout the first 3 years of life. Growth centile curves were constructed using Generalised Additive Models for Location, Shape and Scale. Curves were displayed graphically as centile charts covering the age range 12 weeks to 2 years. Over 100 growth charts were modelled, specific to different combinations of breed, sex and neuter status. Neutering before 37 weeks was associated with a slight upward shift in growth trajectory, whilst neutering after 37 weeks was associated with a slight downward shift in growth trajectory. However, these shifts were small in comparison to inter-individual variability amongst dogs, suggesting that separate curves for neutered dogs were not needed. Five bodyweight categories were created to cover breeds up to 40kg, using both visual assessment and hierarchical cluster analysis of breed-specific growth curves. For 20/24 of the individual breed centile curves, agreement with curves for the corresponding bodyweight categories was good. For the remaining 4 breed curves, occasional deviation across centile lines was observed, but overall agreement was acceptable. This suggested that growth could be described using size categories rather than requiring curves for specific breeds. In the current study, a series of evidence-based growth standards have been developed to facilitate charting of bodyweight in healthy dogs. Additional studies are required to validate these standards and create a clinical tool for growth monitoring in pet dogs.

/pdf/growth-standard-charts-for-monitoring-bodyweight-in-dogs-of-1cy113rom1.pdf

Growth standard charts for monitoring bodyweight in dogs of different sizes.

The main objective of this study was to describe the growth patterns of 4 large dog breeds [Newfoundland (NF), Labrador retriever (LR), Leonberger (LEO), and Irish wolfhound (IW)] raised in domestic environments and concomitant changes in 2 growth-related clinical variables: total serum alkaline phosphatase (ALP) and the circumference of the distal radius and ulna (CDRU). The second objective was to investigate whether these measurements were affected by a range of independent variables like age, sex, litter number, and birth weight. Seven hundred dogs were included in the study, and BW data, separated by breed and sex, were fitted to the Gompertz function. Birth weight, adjusted for litter number, differed significantly between sexes for 3 breeds (LEO, P = 0.004; NF, P = 0.02; LR, P = 0.009) and approached significance for IW (P = 0.07). Estimated mean BW increased rapidly during the first 100 d after birth in all 4 breeds, then plateaued, with maturity being reached between 351 (female LR) and 413 d (male NF). Estimated mature BW ranged from 30.8 kg for the female LR up to 65.7 kg for the male IW. Weight gain, as expressed by the derivative of the Gompertz function, reached its peak in the smallest breed (LR) at the youngest age, 89 d for the females and 95 d for males. Log-transformed BW was significantly related to age, breed, and sex, and the age x sex and age x breed interactions. Within breeds, age, birth weight, and litter number had a significant effect on log-transformed BW. The estimated average CDRU increased from 90 d of age toward a peak at 180 d. Thereafter, CDRU declined and stabilized at about 1 yr of age. The estimated total ALP concentrations decreased from 90 to 360 d of age, after which they stabilized, at mean concentrations varying among breeds from 98 to 131 IU/L. Maximum least squares mean total ALP concentrations were found at 3 mo of age in all breeds, with the greatest least squares mean concentration in the IW breed (713 IU/L). In a mixed model analysis of the complete data set, total ALP was affected (P < 0.001) by age, breed, and the interaction of age x breed. This study described the main factors influencing growth and provided reference data for other studies, including those related to nutrition and disorders of growth.

A longitudinal study on growth and growth variables in dogs of four large breeds raised in domestic environments.

Lay SummaryContrary to the view that social dominance is a wolf feature that was lost by dogs during domestication, we found that Italian free-ranging dogs live in packs with a stable membership and with a clear hierarchical social structure. Moreover, as in wolves and other cooperative animals in which group members rely on the guidance of experienced companions, high social status in dogs was mainly held by elders, and agonistic interactions were highly ritualized.

/pdf/age-graded-dominance-hierarchies-and-social-tolerance-in-4137a52inl.pdf

Age-graded dominance hierarchies and social tolerance in packs of free-ranging dogs

As a species, the dog is unique. Depending on the breed, body weight varies 100-fold from the 1-kg Chihuahua to the 115-kg St. Bernard (1). The time taken for a growing puppy to achieve adult body weight also varies considerably with larger breeds having a longer growth period than smaller breeds. Also the rate of growth during this period is not constant; energy requirements decrease from 3 times maintenance at weaning to1.2 times maintenance as the puppy approaches adulthood (1). The provision of accurate feeding guides is essential if under- and overnutrition are to be prevented. Overnutrition of dogs results in obesity, but in large breeds overnutrition also causes musculoskeletal disorders (2,3). However, present feeding guides are based on "typical" growth data that use only a single equation (4,5). Breed-specific differences in growth patterns might be expected due to huge variations in size, temperament, and coat type, all of which are likely to affect energy requirements. This was evident in a study of six breeds of puppies that demonstrated very different energy requirements despite similar absolute body weights in Great Danes versus Newfoundlands and Briards versus Labrador Retrievers (6). Little information is published on breed-specific variations in puppy growth patterns, and most studies provide only limited data on single breeds, for example, 8-34-mo-old and 6-20-wk-old Labrador Retrievers (7,9) and 0-12-wk-old German Shepherds (8). Other studies are confounded by the use of different groups of dogs to provide data for a variety of age groups (10). Comparisons between these studies are difficult due to differing data presentation and treatment. The aim of this study was to compare the complete growth curves of 12 different-sized dog breeds and to investigate a mathematical basis for the provision of breed-specific feeding guides.

/pdf/body-weight-changes-during-growth-in-puppies-of-different-2rdaiwnm5j.pdf

Body-weight changes during growth in puppies of different breeds.

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Body-weight changes during growth in puppies of different breeds.